What kinds of gray patches are commonly used in cameras?

Hello, there are three kinds of gray chips commonly used in cameras, namely camera gray chip, micro single gray chip and SLR gray chip.

Expansion: At the same time, the gray sheet can be divided into polarizer gray sheet and progressive gray sheet according to different functions, so what is the difference between these two gray sheets? Let's have a look.

First of all, the polarizer gray sheet can be divided into grey mirror and the polarizer in uv mirror. The polarizer in the middle grey mirror belongs to the series of uv mirrors theoretically. The main function of the middle grey mirror is to change the exposure. It's a uniform gray sheet, just for dimming. In the big sun, the grey mirror in the middle can reduce the exposure and achieve the effect of shallow depth of field with a large aperture. In addition, you can take long exposure or B-gate delayed exposure. Medium gray mirror is divided into fixed gray and adjustable gray. Polarizers are mainly used to filter polarized light. For example, the reflection of glass and water surface can be eliminated by this mirror. When shooting scenery, polarized light in the air can be eliminated to increase saturation, and the sky can be bluer.

Gradient gray spots: use gradient color, the color is dark on the top and light on the bottom, and the color is light.

The above is my answer, and the development of some specific contents of the question. I hope my answer can help you!